git.sesse.net Git - ffmpeg/blob - libavformat/rmdec.c

   1 /*
   2  * "Real" compatible demuxer.
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22 #include "rm.h"
  23
  24
  25 static void get_str(ByteIOContext *pb, char *buf, int buf_size)
  26 {
  27     int len, i;
  28     char *q;
  29
  30     len = get_be16(pb);
  31     q = buf;
  32     for(i=0;i<len;i++) {
  33         if (i < buf_size - 1)
  34             *q++ = get_byte(pb);
  35     }
  36     *q = '\0';
  37 }
  38
  39 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
  40 {
  41     int len, i;
  42     char *q;
  43
  44     len = get_byte(pb);
  45     q = buf;
  46     for(i=0;i<len;i++) {
  47         if (i < buf_size - 1)
  48             *q++ = get_byte(pb);
  49     }
  50     *q = '\0';
  51 }
  52
  53 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
  54                                       int read_all)
  55 {
  56     RMContext *rm = s->priv_data;
  57     ByteIOContext *pb = &s->pb;
  58     char buf[256];
  59     uint32_t version;
  60     int i;
  61
  62     /* ra type header */
  63     version = get_be32(pb); /* version */
  64     if (((version >> 16) & 0xff) == 3) {
  65         int64_t startpos = url_ftell(pb);
  66         /* very old version */
  67         for(i = 0; i < 14; i++)
  68             get_byte(pb);
  69         get_str8(pb, s->title, sizeof(s->title));
  70         get_str8(pb, s->author, sizeof(s->author));
  71         get_str8(pb, s->copyright, sizeof(s->copyright));
  72         get_str8(pb, s->comment, sizeof(s->comment));
  73         if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
  74         // fourcc (should always be "lpcJ")
  75         get_byte(pb);
  76         get_str8(pb, buf, sizeof(buf));
  77         }
  78         // Skip extra header crap (this should never happen)
  79         if ((startpos + (version & 0xffff)) > url_ftell(pb))
  80             url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
  81         st->codec->sample_rate = 8000;
  82         st->codec->channels = 1;
  83         st->codec->codec_type = CODEC_TYPE_AUDIO;
  84         st->codec->codec_id = CODEC_ID_RA_144;
  85     } else {
  86         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
  87         /* old version (4) */
  88         get_be32(pb); /* .ra4 */
  89         get_be32(pb); /* data size */
  90         get_be16(pb); /* version2 */
  91         get_be32(pb); /* header size */
  92         flavor= get_be16(pb); /* add codec info / flavor */
  93         rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
  94         get_be32(pb); /* ??? */
  95         get_be32(pb); /* ??? */
  96         get_be32(pb); /* ??? */
  97         rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
  98         st->codec->block_align= get_be16(pb); /* frame size */
  99         rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
 100         get_be16(pb); /* ??? */
 101         if (((version >> 16) & 0xff) == 5) {
 102             get_be16(pb); get_be16(pb); get_be16(pb); }
 103         st->codec->sample_rate = get_be16(pb);
 104         get_be32(pb);
 105         st->codec->channels = get_be16(pb);
 106         if (((version >> 16) & 0xff) == 5) {
 107             get_be32(pb);
 108             buf[0] = get_byte(pb);
 109             buf[1] = get_byte(pb);
 110             buf[2] = get_byte(pb);
 111             buf[3] = get_byte(pb);
 112             buf[4] = 0;
 113         } else {
 114             get_str8(pb, buf, sizeof(buf)); /* desc */
 115             get_str8(pb, buf, sizeof(buf)); /* desc */
 116         }
 117         st->codec->codec_type = CODEC_TYPE_AUDIO;
 118         if (!strcmp(buf, "dnet")) {
 119             st->codec->codec_id = CODEC_ID_AC3;
 120         } else if (!strcmp(buf, "28_8")) {
 121             st->codec->codec_id = CODEC_ID_RA_288;
 122             st->codec->extradata_size= 0;
 123             rm->audio_framesize = st->codec->block_align;
 124             st->codec->block_align = coded_framesize;
 125
 126             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
 127                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 128                 return -1;
 129             }
 130
 131             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
 132         } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
 133             int codecdata_length, i;
 134             get_be16(pb); get_byte(pb);
 135             if (((version >> 16) & 0xff) == 5)
 136                 get_byte(pb);
 137             codecdata_length = get_be32(pb);
 138             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 139                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 140                 return -1;
 141             }
 142
 143             if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
 144             else st->codec->codec_id = CODEC_ID_ATRAC3;
 145             st->codec->extradata_size= codecdata_length;
 146             st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 147             for(i = 0; i < codecdata_length; i++)
 148                 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
 149             rm->audio_framesize = st->codec->block_align;
 150             st->codec->block_align = rm->sub_packet_size;
 151
 152             if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
 153                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
 154                 return -1;
 155             }
 156
 157             rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
 158         } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
 159             int codecdata_length, i;
 160             get_be16(pb); get_byte(pb);
 161             if (((version >> 16) & 0xff) == 5)
 162                 get_byte(pb);
 163             st->codec->codec_id = CODEC_ID_AAC;
 164             codecdata_length = get_be32(pb);
 165             if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
 166                 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
 167                 return -1;
 168             }
 169             if (codecdata_length >= 1) {
 170                 st->codec->extradata_size = codecdata_length - 1;
 171                 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 172                 get_byte(pb);
 173                 for(i = 0; i < st->codec->extradata_size; i++)
 174                     ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
 175             }
 176         } else {
 177             st->codec->codec_id = CODEC_ID_NONE;
 178             pstrcpy(st->codec->codec_name, sizeof(st->codec->codec_name),
 179                     buf);
 180         }
 181         if (read_all) {
 182             get_byte(pb);
 183             get_byte(pb);
 184             get_byte(pb);
 185
 186             get_str8(pb, s->title, sizeof(s->title));
 187             get_str8(pb, s->author, sizeof(s->author));
 188             get_str8(pb, s->copyright, sizeof(s->copyright));
 189             get_str8(pb, s->comment, sizeof(s->comment));
 190         }
 191     }
 192     return 0;
 193 }
 194
 195 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 196 {
 197     RMContext *rm = s->priv_data;
 198     AVStream *st;
 199
 200     rm->old_format = 1;
 201     st = av_new_stream(s, 0);
 202     if (!st)
 203         return -1;
 204     return rm_read_audio_stream_info(s, st, 1);
 205 }
 206
 207 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 208 {
 209     RMContext *rm = s->priv_data;
 210     AVStream *st;
 211     ByteIOContext *pb = &s->pb;
 212     unsigned int tag, v;
 213     int tag_size, size, codec_data_size, i;
 214     int64_t codec_pos;
 215     unsigned int start_time, duration;
 216     char buf[128];
 217     int flags = 0;
 218
 219     tag = get_le32(pb);
 220     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
 221         /* very old .ra format */
 222         return rm_read_header_old(s, ap);
 223     } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
 224         return AVERROR_IO;
 225     }
 226
 227     get_be32(pb); /* header size */
 228     get_be16(pb);
 229     get_be32(pb);
 230     get_be32(pb); /* number of headers */
 231
 232     for(;;) {
 233         if (url_feof(pb))
 234             goto fail;
 235         tag = get_le32(pb);
 236         tag_size = get_be32(pb);
 237         get_be16(pb);
 238 #if 0
 239         printf("tag=%c%c%c%c (%08x) size=%d\n",
 240                (tag) & 0xff,
 241                (tag >> 8) & 0xff,
 242                (tag >> 16) & 0xff,
 243                (tag >> 24) & 0xff,
 244                tag,
 245                tag_size);
 246 #endif
 247         if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
 248             goto fail;
 249         switch(tag) {
 250         case MKTAG('P', 'R', 'O', 'P'):
 251             /* file header */
 252             get_be32(pb); /* max bit rate */
 253             get_be32(pb); /* avg bit rate */
 254             get_be32(pb); /* max packet size */
 255             get_be32(pb); /* avg packet size */
 256             get_be32(pb); /* nb packets */
 257             get_be32(pb); /* duration */
 258             get_be32(pb); /* preroll */
 259             get_be32(pb); /* index offset */
 260             get_be32(pb); /* data offset */
 261             get_be16(pb); /* nb streams */
 262             flags = get_be16(pb); /* flags */
 263             break;
 264         case MKTAG('C', 'O', 'N', 'T'):
 265             get_str(pb, s->title, sizeof(s->title));
 266             get_str(pb, s->author, sizeof(s->author));
 267             get_str(pb, s->copyright, sizeof(s->copyright));
 268             get_str(pb, s->comment, sizeof(s->comment));
 269             break;
 270         case MKTAG('M', 'D', 'P', 'R'):
 271             st = av_new_stream(s, 0);
 272             if (!st)
 273                 goto fail;
 274             st->id = get_be16(pb);
 275             get_be32(pb); /* max bit rate */
 276             st->codec->bit_rate = get_be32(pb); /* bit rate */
 277             get_be32(pb); /* max packet size */
 278             get_be32(pb); /* avg packet size */
 279             start_time = get_be32(pb); /* start time */
 280             get_be32(pb); /* preroll */
 281             duration = get_be32(pb); /* duration */
 282             st->start_time = start_time;
 283             st->duration = duration;
 284             get_str8(pb, buf, sizeof(buf)); /* desc */
 285             get_str8(pb, buf, sizeof(buf)); /* mimetype */
 286             codec_data_size = get_be32(pb);
 287             codec_pos = url_ftell(pb);
 288             st->codec->codec_type = CODEC_TYPE_DATA;
 289             av_set_pts_info(st, 64, 1, 1000);
 290
 291             v = get_be32(pb);
 292             if (v == MKTAG(0xfd, 'a', 'r', '.')) {
 293                 /* ra type header */
 294                 if (rm_read_audio_stream_info(s, st, 0))
 295                     return -1;
 296             } else {
 297                 int fps, fps2;
 298                 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
 299                 fail1:
 300                     av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
 301                     goto skip;
 302                 }
 303                 st->codec->codec_tag = get_le32(pb);
 304 //                av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
 305                 if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
 306                     && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
 307                     && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
 308                     && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
 309                     goto fail1;
 310                 st->codec->width = get_be16(pb);
 311                 st->codec->height = get_be16(pb);
 312                 st->codec->time_base.num= 1;
 313                 fps= get_be16(pb);
 314                 st->codec->codec_type = CODEC_TYPE_VIDEO;
 315                 get_be32(pb);
 316                 fps2= get_be16(pb);
 317                 get_be16(pb);
 318
 319                 st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
 320
 321                 if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
 322                     //check is redundant as get_buffer() will catch this
 323                     av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
 324                     return -1;
 325                 }
 326                 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
 327                 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
 328
 329 //                av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
 330                 st->codec->time_base.den = fps * st->codec->time_base.num;
 331                 switch(((uint8_t*)st->codec->extradata)[4]>>4){
 332                 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
 333                 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
 334                 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
 335                 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
 336                 default: goto fail1;
 337                 }
 338             }
 339 skip:
 340             /* skip codec info */
 341             size = url_ftell(pb) - codec_pos;
 342             url_fskip(pb, codec_data_size - size);
 343             break;
 344         case MKTAG('D', 'A', 'T', 'A'):
 345             goto header_end;
 346         default:
 347             /* unknown tag: skip it */
 348             url_fskip(pb, tag_size - 10);
 349             break;
 350         }
 351     }
 352  header_end:
 353     rm->nb_packets = get_be32(pb); /* number of packets */
 354     if (!rm->nb_packets && (flags & 4))
 355         rm->nb_packets = 3600 * 25;
 356     get_be32(pb); /* next data header */
 357     return 0;
 358
 359  fail:
 360     for(i=0;i<s->nb_streams;i++) {
 361         av_free(s->streams[i]);
 362     }
 363     return AVERROR_IO;
 364 }
 365
 366 static int get_num(ByteIOContext *pb, int *len)
 367 {
 368     int n, n1;
 369
 370     n = get_be16(pb);
 371     (*len)-=2;
 372     if (n >= 0x4000) {
 373         return n - 0x4000;
 374     } else {
 375         n1 = get_be16(pb);
 376         (*len)-=2;
 377         return (n << 16) | n1;
 378     }
 379 }
 380
 381 /* multiple of 20 bytes for ra144 (ugly) */
 382 #define RAW_PACKET_SIZE 1000
 383
 384 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
 385     RMContext *rm = s->priv_data;
 386     ByteIOContext *pb = &s->pb;
 387     int len, num, res, i;
 388     AVStream *st;
 389     uint32_t state=0xFFFFFFFF;
 390
 391     while(!url_feof(pb)){
 392         *pos= url_ftell(pb);
 393         if(rm->remaining_len > 0){
 394             num= rm->current_stream;
 395             len= rm->remaining_len;
 396             *timestamp = AV_NOPTS_VALUE;
 397             *flags= 0;
 398         }else{
 399             state= (state<<8) + get_byte(pb);
 400
 401             if(state == MKBETAG('I', 'N', 'D', 'X')){
 402                 len = get_be16(pb) - 6;
 403                 if(len<0)
 404                     continue;
 405                 goto skip;
 406             }
 407
 408             if(state > (unsigned)0xFFFF || state < 12)
 409                 continue;
 410             len=state;
 411             state= 0xFFFFFFFF;
 412
 413             num = get_be16(pb);
 414             *timestamp = get_be32(pb);
 415             res= get_byte(pb); /* reserved */
 416             *flags = get_byte(pb); /* flags */
 417
 418
 419             len -= 12;
 420         }
 421         for(i=0;i<s->nb_streams;i++) {
 422             st = s->streams[i];
 423             if (num == st->id)
 424                 break;
 425         }
 426         if (i == s->nb_streams) {
 427 skip:
 428             /* skip packet if unknown number */
 429             url_fskip(pb, len);
 430             rm->remaining_len -= len;
 431             continue;
 432         }
 433         *stream_index= i;
 434
 435         return len;
 436     }
 437     return -1;
 438 }
 439
 440 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 441 {
 442     RMContext *rm = s->priv_data;
 443     ByteIOContext *pb = &s->pb;
 444     AVStream *st;
 445     int i, len, tmp, j;
 446     int64_t timestamp, pos;
 447     uint8_t *ptr;
 448     int flags;
 449
 450     if (rm->audio_pkt_cnt) {
 451         // If there are queued audio packet return them first
 452         st = s->streams[rm->audio_stream_num];
 453         if (st->codec->codec_id == CODEC_ID_AAC)
 454             av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
 455         else {
 456         av_new_packet(pkt, st->codec->block_align);
 457         memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
 458                (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
 459                st->codec->block_align);
 460         }
 461         rm->audio_pkt_cnt--;
 462         pkt->flags = 0;
 463         pkt->stream_index = rm->audio_stream_num;
 464     } else if (rm->old_format) {
 465         st = s->streams[0];
 466         if (st->codec->codec_id == CODEC_ID_RA_288) {
 467             int x, y;
 468
 469             for (y = 0; y < rm->sub_packet_h; y++)
 470                 for (x = 0; x < rm->sub_packet_h/2; x++)
 471                     if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
 472                         return AVERROR_IO;
 473             rm->audio_stream_num = 0;
 474             rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
 475             // Release first audio packet
 476             av_new_packet(pkt, st->codec->block_align);
 477             memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
 478             pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
 479             pkt->stream_index = 0;
 480         } else {
 481             /* just read raw bytes */
 482             len = RAW_PACKET_SIZE;
 483             len= av_get_packet(pb, pkt, len);
 484             pkt->stream_index = 0;
 485             if (len <= 0) {
 486                 return AVERROR_IO;
 487             }
 488             pkt->size = len;
 489         }
 490     } else {
 491         int seq=1;
 492 resync:
 493         len=sync(s, &timestamp, &flags, &i, &pos);
 494         if(len<0)
 495             return AVERROR_IO;
 496         st = s->streams[i];
 497
 498         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 499             int h, pic_num, len2, pos;
 500
 501             h= get_byte(pb); len--;
 502             if(!(h & 0x40)){
 503                 seq = get_byte(pb); len--;
 504             }
 505
 506             if((h & 0xc0) == 0x40){
 507                 len2= pos= 0;
 508             }else{
 509                 len2 = get_num(pb, &len);
 510                 pos = get_num(pb, &len);
 511             }
 512             /* picture number */
 513             pic_num= get_byte(pb); len--;
 514             rm->remaining_len= len;
 515             rm->current_stream= st->id;
 516
 517 //            av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);
 518             if(len2 && len2<len)
 519                 len=len2;
 520             rm->remaining_len-= len;
 521             av_get_packet(pb, pkt, len);
 522
 523         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 524             if ((st->codec->codec_id == CODEC_ID_RA_288) ||
 525                 (st->codec->codec_id == CODEC_ID_COOK) ||
 526                 (st->codec->codec_id == CODEC_ID_ATRAC3)) {
 527                 int x;
 528                 int sps = rm->sub_packet_size;
 529                 int cfs = rm->coded_framesize;
 530                 int h = rm->sub_packet_h;
 531                 int y = rm->sub_packet_cnt;
 532                 int w = rm->audio_framesize;
 533
 534                 if (flags & 2)
 535                     y = rm->sub_packet_cnt = 0;
 536                 if (!y)
 537                     rm->audiotimestamp = timestamp;
 538
 539                 switch(st->codec->codec_id) {
 540                     case CODEC_ID_RA_288:
 541                         for (x = 0; x < h/2; x++)
 542                             get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
 543                         break;
 544                     case CODEC_ID_ATRAC3:
 545                     case CODEC_ID_COOK:
 546                         for (x = 0; x < w/sps; x++)
 547                             get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
 548                         break;
 549                 }
 550
 551                 if (++(rm->sub_packet_cnt) < h)
 552                     goto resync;
 553                 else {
 554                     rm->sub_packet_cnt = 0;
 555                     rm->audio_stream_num = i;
 556                     rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
 557                     // Release first audio packet
 558                     av_new_packet(pkt, st->codec->block_align);
 559                     memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
 560                     timestamp = rm->audiotimestamp;
 561                     flags = 2; // Mark first packet as keyframe
 562                 }
 563             } else if (st->codec->codec_id == CODEC_ID_AAC) {
 564                 int x;
 565                 rm->audio_stream_num = i;
 566                 rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
 567                 if (rm->sub_packet_cnt) {
 568                     for (x = 0; x < rm->sub_packet_cnt; x++)
 569                         rm->sub_packet_lengths[x] = get_be16(pb);
 570                     // Release first audio packet
 571                     rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
 572                     av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
 573                     flags = 2; // Mark first packet as keyframe
 574                 }
 575             } else
 576                 av_get_packet(pb, pkt, len);
 577
 578         } else
 579             av_get_packet(pb, pkt, len);
 580
 581         if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
 582            || st->discard >= AVDISCARD_ALL){
 583             av_free_packet(pkt);
 584             goto resync;
 585         }
 586
 587         pkt->stream_index = i;
 588
 589 #if 0
 590         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 591             if(st->codec->codec_id == CODEC_ID_RV20){
 592                 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
 593                 av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", timestamp, timestamp*512LL/25, seq);
 594
 595                 seq |= (timestamp&~0x3FFF);
 596                 if(seq - timestamp >  0x2000) seq -= 0x4000;
 597                 if(seq - timestamp < -0x2000) seq += 0x4000;
 598             }
 599         }
 600 #endif
 601         pkt->pts= timestamp;
 602         if(flags&2){
 603             pkt->flags |= PKT_FLAG_KEY;
 604             if((seq&0x7F) == 1)
 605                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
 606         }
 607     }
 608
 609     /* for AC3, needs to swap bytes */
 610     if (st->codec->codec_id == CODEC_ID_AC3) {
 611         ptr = pkt->data;
 612         for(j=0;j<len;j+=2) {
 613             tmp = ptr[0];
 614             ptr[0] = ptr[1];
 615             ptr[1] = tmp;
 616             ptr += 2;
 617         }
 618     }
 619     return 0;
 620 }
 621
 622 static int rm_read_close(AVFormatContext *s)
 623 {
 624     RMContext *rm = s->priv_data;
 625
 626     av_free(rm->audiobuf);
 627     return 0;
 628 }
 629
 630 static int rm_probe(AVProbeData *p)
 631 {
 632     /* check file header */
 633     if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
 634          p->buf[2] == 'M' && p->buf[3] == 'F' &&
 635          p->buf[4] == 0 && p->buf[5] == 0) ||
 636         (p->buf[0] == '.' && p->buf[1] == 'r' &&
 637          p->buf[2] == 'a' && p->buf[3] == 0xfd))
 638         return AVPROBE_SCORE_MAX;
 639     else
 640         return 0;
 641 }
 642
 643 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
 644                                int64_t *ppos, int64_t pos_limit)
 645 {
 646     RMContext *rm = s->priv_data;
 647     int64_t pos, dts;
 648     int stream_index2, flags, len, h;
 649
 650     pos = *ppos;
 651
 652     if(rm->old_format)
 653         return AV_NOPTS_VALUE;
 654
 655     url_fseek(&s->pb, pos, SEEK_SET);
 656     rm->remaining_len=0;
 657     for(;;){
 658         int seq=1;
 659         AVStream *st;
 660
 661         len=sync(s, &dts, &flags, &stream_index2, &pos);
 662         if(len<0)
 663             return AV_NOPTS_VALUE;
 664
 665         st = s->streams[stream_index2];
 666         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 667             h= get_byte(&s->pb); len--;
 668             if(!(h & 0x40)){
 669                 seq = get_byte(&s->pb); len--;
 670             }
 671         }
 672
 673         if((flags&2) && (seq&0x7F) == 1){
 674 //            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
 675             av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
 676             if(stream_index2 == stream_index)
 677                 break;
 678         }
 679
 680         url_fskip(&s->pb, len);
 681     }
 682     *ppos = pos;
 683     return dts;
 684 }
 685
 686 AVInputFormat rm_demuxer = {
 687     "rm",
 688     "rm format",
 689     sizeof(RMContext),
 690     rm_probe,
 691     rm_read_header,
 692     rm_read_packet,
 693     rm_read_close,
 694     NULL,
 695     rm_read_dts,
 696 };